linux-kernel - Re: [PATCH 11/13] dtb: amd: Add PCIe SMMU device tree node

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Date:	Thu, 28 Jan 2016 15:17:33 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Robin Murphy <robin.murphy@....com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	will.deacon@....com, robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, arm@...nel.org,
	brijeshkumar.singh@....com, thomas.lendacky@....com,
	leo.duran@....com
Subject: Re: [PATCH 11/13] dtb: amd: Add PCIe SMMU device tree node

On Thursday 28 January 2016 12:20:58 Robin Murphy wrote:
> >
> > Will, Robin, thoughts?
> 
> Any IDs specified here would only apply to DMA by the "platform device" 
> side of the host controller itself (as would an equivalent "iommus" 
> property on pcie0 once I finish the SMMUv2 generic binding support I'm 
> working on). In terms of PCI devices, the "mmu-masters" property is 
> overloaded such that only its existence matters, to identify that there 
> _is_ a relationship between the SMMU and the PCI bus(es) behind that 
> host controller.

I wasn't aware that this was actually still specified. I had hoped
we were getting rid of mmu-masters before anyone actually started
using it, but now I see it in ns2.dtsi and fsl-ls2080a.dtsi.

Does anyone know what happened to the plan to use the iommu DT binding
for the ARM SMMU instead? Do we now have to support both ways indefinitely?

	Arnd